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(No Model.)

0. F. PALMER.

GRATB BAR.

No. 311,517. Patented Feb.3,1885.

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PATENT CYRUS F. PALMER, OF UTIGA, NEW YORK.

GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 311,517, dated February 3, 1885.

Application filed March 24, 1884. (No model.)

To all whom it may concern.-

Be it known that l, CYRUS F. PALMER, of Utica, in the county of Oneida and State of New York, have invented an Improvement in Grate-Bars for Stoves, Hot-Air Furnaces, and Steam and Hot-Water Heaters, of which the following is a specification,reference being bad to the accompanying drawings, in which- Figure l is a vertical section of two tubular gratebars embodying my invention. Fig. 2 is a plan of the same.

My invention consists in a grate composed of revolving perforated tubular grate-bars, preferably cylindrical. The perforations serve as air-passages to keep the bars cool and to prevent warping, and they are preferably placed, as shown, so that the ashes will not fill or clog the tubular bar. I use in connection with these bars clinker-teeth arranged transve1'sely,whose double purpose is to form a good fnel-bed,also to crush and loosen clinkers, ashes, or any other substances, allowing'the same to pass down between the bars as they are revolved. Grate-bars have been so made as to be capable of revolution by means ofgears. Grate-bars have also been made with projecting or transverse teeth, and these I do not claim.

Referring to the drawings, A represents a frame or grate-holder, which may be large or small, square or round, and suited to receive any number of bars wished. The grate-bars B are each made with journals 0 (1 near each end, resting in sockets or hearings in the frame A. The body of grate-bar e is tubular, F showing the bore of the shaft or body of the bar, and 2' i i showing rows of air-holes through the shell of the gratebar, and preferably placed, as shown, so that no hole will come on the top or crown of the grate-bar, which would render the tube liable to clog. The clinker-teeth are shown at K. The wheels Z are geared together at the journals (1, so that all the bars are turned together.

It will be understood from the aforegoing specification and an inspection of the drawings that the clinker-teeth are of triangular form, and that three fiat surfaces are provided by each for aiding in forming a horizontal fire-bed-that is, one or another of these surfaces, in conjunction with a corresponding surface of another clinker-tooth or corresponding surfaces of several other clinkerteeth, is always brought up to a horizontal plane when used to form a fire-bed, and that in the construction of hollow grate-bars having these triangular clinker-teeth the air-holes t i i are arranged, respectively, at points one-third the distance around the circumferenee of the hollow grate-bar and at equal distances apart, so that one hole is directly opposite a sharp corner of the clinker-tooth,and thus when a flat side of the tooth is being used to form a fire-bed the holes 2' i i will all be below said horizontal surface, and the entrance of air into and passage of the same out of the gratebar will not be interfered with by the mass of fuel and ashes of the fire-bed. This mode of combining air-holes, hollow grate-bar, and triangular clinker-teeth differs very essentially from the combinations shown in Letters Patent numbered, respectively, 180,616 and 303,032, because in said patents the holes come directly at the tops of the grate bars, and are liable to be clogged with the mass of ashes and coal resting upon the gratebars. My mode also differs from Letters Patent No. 293,274, because in said patent air-holes are not combined with the hollow grate-bars and triangular clinker'teeth, and hence, while air can pass from end to end of the grate-bars,it cannot pass sidewise through the same and up into the mass of burning fuel, as under my construction.

WVhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The hollow grate-bar having transverse air-passages,the entrances to which are directed away from the falling ashes when the bar is in its normal supporting position, substantially as and for the purpose described.

'2. The combination ot'the hollow grate-bar, clinker-teeth of triangularform, and air-holes arranged respectively opposite a sharp pointof a clinker-tooth and at equal distances apart around the gratebar, substantially as and for the purpose described.

CYRUS F. PALMER.

Witnesses:

J. LEWIs J oNEs, EDWARD S. KINGSTON. 

